Add to forbid struct in C files and in scopes that is not global

[NiumXp]

Fixes #437, #435 and #347.

I did to show an error when a struct is in a C file, but what about enum, union and typedef, must they also be fobidden?

• Add to report error when struct is in C file
• Add to report error when union is in C file
• Add to report error when enum is in C file
• Add to report error when typedef is in C file

[matthieu42Network]

Hello, we think it's a good idea but we need to update the pdf according to this.
Do you want to do this in this PR or will you add it on another one?

[NiumXp]

Hello, we think it's a good idea but we need to update the pdf according to this. Do you want to do this in this PR or will you add it on another one?

Yeah, I do, but, I don't know how to generate the .pdf file after editing the .tex file, can you explain how can I do it?

[matthieu42Network]

I will do it.